三相风力发电机低电压穿越控制方法仿真

Simulation of Low Voltage Traverse Control Method for Three-phase Wind Turbine

为克服发电机局部电压过高导致的电子跳跃问题,提出三相风力发电机的低电压穿越控制方法。建立三相低电压矩阵,对正负序电压进行分量,实现低电压建模操作。再进行三相风力发电机低电压的开关切换,调节基础穿越控制稳定性,选择合适风力发电机逆变器进行低电压穿越调节,实现三相风力发电机的低电压穿越控制。仿真结果表明,随着三相风力发电机低电压穿越控制方法的应用,发电机局部电压的高次项极值不断降低,局部区间电压的实际数值明显缩小,由局部电压过高引起的电子跳跃行为不再具有促进低电压穿越现象频繁发生的能力。

In order to overcome the problem of electron hopping caused by high local voltage of electric generator,this paper proposed a method to control low voltage ride-through for three-phase wind-driven generator.First of all,the three phase low voltage matrix was established,and the positive and negative voltage components were used to achieve the low-voltage modeling operation.On this basis,low-voltage switching of three-phase wind turbine was used to regulate the stability of basic ride-through control.Moreover,appropriate inverters of wind turbine were selected for low-voltage ride-through adjustment.Finally,the low-voltage ride-through control for three-phase wind turbine was achieved.Simulation results show that the proposed method can decrease the extremum of higher-order term of local voltage,and reduce actual numerical range of local voltage obviously.The electron hopping caused by high local voltage will no longer has the ability to promote frequent low voltage ride-through phenomena.